To find the total cost of Kyrian's haircut including the tip, you can follow these steps:
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Calculate the tip amount: \[ \text{Tip} = \text{Haircut cost} \times \text{Tip percentage} = 13.99 \times 0.20 \] \[ \text{Tip} = 13.99 \times 0.20 = 2.798 \]
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Round the tip to the nearest hundredth: \[ \text{Tip} \approx 2.80 \]
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Add the tip to the original cost of the haircut to find the total cost: \[ \text{Total Cost} = \text{Haircut cost} + \text{Tip} = 13.99 + 2.80 = 16.79 \]
Thus, Kyrian's total cost is $16.79.